The Study Of Polarization Properties Of Blazars

Active Galactic Nuclei(AGN)is a special kind of celestial body,which has the characteristic of polarization.Blazars are a subclass of AGN showing jets almost aligning with the observer's line of sight.High polarization is the typical feature of blazar which distinguishes it from other AGNs.The polarization of AGN is produced by the synchrotron radiation of relativistic electrons in the jet.The infrared-optical radiation of Blazar are mainly from the synchrotron radiation of relativistic electrons in the jet,so Blazars' has high polarization in the optical wavelength.In the collective electron synchrotron radiation,the degree of polarization is only related to the electron spectral index.When the spectrum follows a single power law shape,the degree of polarization of the blazars is only related to the spectral index:p ? ?-b.Blazars' spectral index is generally 0 ? 2,the corresponding degree of polarization is 60% ? 82%.However,the actual observed degree of polarization is lower than that of synchrotron radiation,and blazars' polarization varies with wavelength.This work is to find out the variation of polarization with wavelength by analyzing the polarization data.We refer to our previous work on the relationship between polarization and wavelength,and find out the influence of Faraday rotation and interstellar turbulence on polarization.The degree of polarization varies with wavelength as a power law: p ? ?-b.After finding the variation of polarization with wavelength,we prove the relationship is consistent with observations.We look for blazars in the near infrared to the optical polarization data,and by fitting these polarization data,we found that the main cause of the variation of the variation of the polarization is the turbulence in the jet.